Fair Values of Assets and Liabilities - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (Recurring [Member], Derivative Loan Commitments and Forward Loan Sale Commitments, Net [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Recurring [Member] | Derivative Loan Commitments and Forward Loan Sale Commitments, Net [Member]
   
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Beginning balance $ 276 $ 508
Total realized and unrealized losses included in net income (188) (232)
Ending balance 88 276
Total realized gain relating to instruments still held at year end $ 88 $ 276